From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CD253AC0D0 for ; Tue, 7 Apr 2026 11:14:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775560462; cv=none; b=cexO4UJbGr7FDnxsy3UHEkuCcyFYIbwbPzV9AMog7lkCBq44j2ufwjAOtPhMSkegB2pt07Z1aBN+dWimJOy298ze7KTjad8j8Cdu391zuKK8BdWH2D77XPbeC4G63HWiWWNA+6CmK4cyKdP/SX4eobul5aWqJNxVpfib07/Cudw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775560462; c=relaxed/simple; bh=hNSzVR398HFEwUTCqzLvI2/9v+4Mr+dxNq6+camx0mA=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=VUyDhVsLRt/kNMC8lQZTf1nxwuofv+pAlTtIsGUKmC7vV36CyUrbRwkeXxqGf4XdEhkr5E/oIIm9SXDDup+qnEjFE8a2VNsD/gOOiksMIiBOdji/qZDSiA3BWMOlK7frqFg40eRsbJlxri7QyZxiuJ/59In06Vs4ZP76CKkyphY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=S/Mk5iZY; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="S/Mk5iZY" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DAAEBC116C6; Tue, 7 Apr 2026 11:14:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1775560462; bh=hNSzVR398HFEwUTCqzLvI2/9v+4Mr+dxNq6+camx0mA=; h=Subject:To:Cc:From:Date:From; b=S/Mk5iZYzXWC3v/gx+vx92LcrK9ca/gyjatZrbtIA/glRNsTVnx69yHZaFmDp9X2D 8FsdLeBG0CjqXbctyvmUTkOlkmqpYUzroYa0yBaq2WfZ3ZWC0EvcYJ73WsMo37izof SONiiQo2paz777Uuwybuk1vAdO39FlQBcZ6XJaFs= Subject: FAILED: patch "[PATCH] wifi: virt_wifi: remove SET_NETDEV_DEV to avoid" failed to apply to 6.18-stable tree To: alex.popov@linux.com,gregkh@linuxfoundation.org,johannes.berg@intel.com,leitao@debian.org Cc: From: Date: Tue, 07 Apr 2026 13:14:16 +0200 Message-ID: <2026040716-embezzle-hula-66ad@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.18-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.18.y git checkout FETCH_HEAD git cherry-pick -x 789b06f9f39cdc7e895bdab2c034e39c41c8f8d6 # git commit -s git send-email --to '' --in-reply-to '2026040716-embezzle-hula-66ad@gregkh' --subject-prefix 'PATCH 6.18.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 789b06f9f39cdc7e895bdab2c034e39c41c8f8d6 Mon Sep 17 00:00:00 2001 From: Alexander Popov Date: Wed, 25 Mar 2026 01:46:02 +0300 Subject: [PATCH] wifi: virt_wifi: remove SET_NETDEV_DEV to avoid use-after-free Currently we execute `SET_NETDEV_DEV(dev, &priv->lowerdev->dev)` for the virt_wifi net devices. However, unregistering a virt_wifi device in netdev_run_todo() can happen together with the device referenced by SET_NETDEV_DEV(). It can result in use-after-free during the ethtool operations performed on a virt_wifi device that is currently being unregistered. Such a net device can have the `dev.parent` field pointing to the freed memory, but ethnl_ops_begin() calls `pm_runtime_get_sync(dev->dev.parent)`. Let's remove SET_NETDEV_DEV for virt_wifi to avoid bugs like this: ================================================================== BUG: KASAN: slab-use-after-free in __pm_runtime_resume+0xe2/0xf0 Read of size 2 at addr ffff88810cfc46f8 by task pm/606 Call Trace: dump_stack_lvl+0x4d/0x70 print_report+0x170/0x4f3 ? __pfx__raw_spin_lock_irqsave+0x10/0x10 kasan_report+0xda/0x110 ? __pm_runtime_resume+0xe2/0xf0 ? __pm_runtime_resume+0xe2/0xf0 __pm_runtime_resume+0xe2/0xf0 ethnl_ops_begin+0x49/0x270 ethnl_set_features+0x23c/0xab0 ? __pfx_ethnl_set_features+0x10/0x10 ? kvm_sched_clock_read+0x11/0x20 ? local_clock_noinstr+0xf/0xf0 ? local_clock+0x10/0x30 ? kasan_save_track+0x25/0x60 ? __kasan_kmalloc+0x7f/0x90 ? genl_family_rcv_msg_attrs_parse.isra.0+0x150/0x2c0 genl_family_rcv_msg_doit+0x1e7/0x2c0 ? __pfx_genl_family_rcv_msg_doit+0x10/0x10 ? __pfx_cred_has_capability.isra.0+0x10/0x10 ? stack_trace_save+0x8e/0xc0 genl_rcv_msg+0x411/0x660 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_ethnl_set_features+0x10/0x10 netlink_rcv_skb+0x121/0x380 ? __pfx_genl_rcv_msg+0x10/0x10 ? __pfx_netlink_rcv_skb+0x10/0x10 ? __pfx_down_read+0x10/0x10 genl_rcv+0x23/0x30 netlink_unicast+0x60f/0x830 ? __pfx_netlink_unicast+0x10/0x10 ? __pfx___alloc_skb+0x10/0x10 netlink_sendmsg+0x6ea/0xbc0 ? __pfx_netlink_sendmsg+0x10/0x10 ? __futex_queue+0x10b/0x1f0 ____sys_sendmsg+0x7a2/0x950 ? copy_msghdr_from_user+0x26b/0x430 ? __pfx_____sys_sendmsg+0x10/0x10 ? __pfx_copy_msghdr_from_user+0x10/0x10 ___sys_sendmsg+0xf8/0x180 ? __pfx____sys_sendmsg+0x10/0x10 ? __pfx_futex_wait+0x10/0x10 ? fdget+0x2e4/0x4a0 __sys_sendmsg+0x11f/0x1c0 ? __pfx___sys_sendmsg+0x10/0x10 do_syscall_64+0xe2/0x570 ? exc_page_fault+0x66/0xb0 entry_SYSCALL_64_after_hwframe+0x77/0x7f This fix may be combined with another one in the ethtool subsystem: https://lore.kernel.org/all/20260322075917.254874-1-alex.popov@linux.com/T/#u Fixes: d43c65b05b848e0b ("ethtool: runtime-resume netdev parent in ethnl_ops_begin") Cc: stable@vger.kernel.org Signed-off-by: Alexander Popov Acked-by: Greg Kroah-Hartman Reviewed-by: Breno Leitao Link: https://patch.msgid.link/20260324224607.374327-1-alex.popov@linux.com Signed-off-by: Johannes Berg diff --git a/drivers/net/wireless/virtual/virt_wifi.c b/drivers/net/wireless/virtual/virt_wifi.c index 885dc7243e8d..97bd39d89e98 100644 --- a/drivers/net/wireless/virtual/virt_wifi.c +++ b/drivers/net/wireless/virtual/virt_wifi.c @@ -557,7 +557,6 @@ static int virt_wifi_newlink(struct net_device *dev, eth_hw_addr_inherit(dev, priv->lowerdev); netif_stacked_transfer_operstate(priv->lowerdev, dev); - SET_NETDEV_DEV(dev, &priv->lowerdev->dev); dev->ieee80211_ptr = kzalloc_obj(*dev->ieee80211_ptr); if (!dev->ieee80211_ptr) {